focus problem on a zenith

[drh4683]

Ive got a 26KC20 zenith color chassis with a big focus problem. The 1V2 is arcing inside the tube, looks like this was a previous problem as when I got the set, the 1V2 was missing and the socket is a little burnt up from this. The socket was smoking with a new 1V2. It appears that this was repaired in the past, I can tell by the bad soilder joints on a "new" 1v2 socket, which obviously didnt help. I did some resistance checks nearby and it all seems ok, since the filament of the 1v2 is in series with a winding off the flyback, is it possible the flyback has developed some kind of short? Like I say, the 1v2 is arcing from inside, down the the pins of the tube. Very wierd. Ive never seen this happen before